ASA SIZING BEHAVIOUR IN HIGH-YIELD PULP CONTAINING PULP FURNISH

摘要

In recent years, there is an increasing interest in using high-yield pulp (HYP), as a partial replacement for hardwood bleached kraft pulp (HWBKP) in the production of high-quality fine papers as a cost-effective way of improving their product performance. In this study, the ASA sizing behaviour in High-yield pulp containing pulp furnish was investigated. The results showed that the substitution of an aspen HYP for HWBKP can increase the ASA sizing performance at a HYP substitution of up to 15%~20% by the fact that HYP contains more anionic groups (carboxylic and sulfonic groups), which help retain the ASA size and increase the sizing degrees. The ASA sizing was effective in a wide pH range of 6.5~9.0 which suggest that under the industrial conditions, a good sizing degree can be obtained from ASA sizing when the HYP-containing furnish is used. With the pulp temperature increasing, the ASA sizing efficiency decreased. In the presence of Poly- aluminum chloride (PAC), Polyethylenimine (PEI) and poly diallyl-dimethyl ammonium chloride (PDADMAC) had positive effect on improving the ASA sizing efficiency.